Photographic apparatus adapted for view-taking enlargements and screen projection



Dec. 3, 1929. E, QEHMICHEN l,738,445 PHOTOGRAPHIC APPARATUS ADAPTED. FOR VIEW TAKING ENLARGEMENTS AND SCREEN PROJECTION .Filed Nov. 16; 1925 2'Sheets$heet 1 E.' OEHMICHEN PHOTOGRAPHIC APPARATUS ADAPTED FOR VIEW TAKING ENLARGEMENTS AND SCREEN PROJECTION Dec. 3, 1929.

Filed Nov. 16,1925 2 Sheets-Sheet 2 v w. H

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Patented Dec. 3, 1929 UNITED STATES PATENT- OFFICE ETIENNE OEHMICHEN, or VALENTIGNEY, ERANcE PHOTOGRAPHIC APPARATUS ADAPTED IEOIR, VIEW-TAKING ENLARGEMENTS AND SCREEN PROJECTION Application filed November 16, 1925, Serial No. 69,467, and in France April 21, 1925.

The present invention relates to a photoaxis X X 25 is a ring which serves to supgraphic apparatus which serves at the same port the said optical system. The said ring time for the taking of views of small size is carried by a support 3 secured upon a upon films, for the enlargement of said views. base 4. In front of the objective 2 is dis- 5 and for the screen projection of the positive posed a device comprising a coni'erging lens 55 views. 26 and a small screen 27 secured thereto; the

My said apparatus consists of two distinct Whole device may be brought, for example, parts whereof the first contains the objective, by pivoting about the axis Yinto line the shutter and the gate for the film, and the with the objective or into the. position in second is mounted upon the first by guides which the same is left free. 60 or tenons which provide for the instant en- \Vhcnthe device 2627 is brought before gagement or removal. The second part conthe objective, the converging lens 26 which is tains the mechanism for the winding and suitably calculated will augment the conunwinding of ti e film, the film aperture, and vergence of the projection beam, thus forma view counter.

The reduced images are formed at frefocused, of the film to be projected, without quent intervals upon the film which is wound any change in the adjustment of the main on a drum of a large diameter such that the objective. At the same time, the projection additional thickness due to the entire film on the main screen is cut off, and the operator shall be negligible with reference to the said alone can observe the image and its position. diameter, or otherwise stated, that one may With this arrangement, the operator can consider as equal the amount of film wound make apreliminary examination of the image, on the drum for a given angle of rotation and may select the proper images for projecwhether the first or the last parts of the film tion upon the screen; he may on the other 5 are to be considered. hand, rotate the whole apparatus 011 the axis e In this manner, I provide a combined ap- X X in the proper direction, according as paratus for view taking purposes. For enthe question relates to views employed ,aclargement and screen projection, I employ cording to the height or the 'width of the only the main body containing the objective, said aperture of the apparatus.

30 and the said body is fitted to an apparatus The front part of the lantern containing containing a condenser and an illuminant. the main body 1 consists of a movable aper- The appended diagrammatic drawings tured shutter 14 which is forwardly urged show by way of example an embodiment of by the springs 30. When the main body 1 the said invention. is attached to the front part, this Will com- 5 Fig. 1 shows an arrangement for screen press the said springs and will oblige the projection or enlargement. shutter 14? to bear upon the back part of Fig. 2 shows a modified form of the apthe passage 19. paratus in the operative position. The film is engaged in the lantern carrier Fig. 3 shows an arrangement of the enby means of a suitable device. The end of 40 larging frame. the film is attached to a notched hub 21 upon Figs. 4 to 7 relate to the enlarging frame. which the film is maintained in the wound In Fig. 1 which relates to the arrangement condition and said hub is disposed upon an in which 1 is the front part of the apparatus axle 31, secured to the main body of the to which is secured an objective 2 fitted with lantern and controlled by a handle 32. The 45 a shutter. This box 1 is placed on the front film is then laterally engaged in an aperture part of a lantern comprising a condenser 23, 33 surrounded by the attaching shutter 14:, a funnel shaped extension to which the said and its end is attached to the drum 34 conbox is attached and a lamp 2 1, the whole trolled by the handle 35, after havin cleared system forming a single unit which is rothe rollers 18. By the operation of the key 60 tatable through 90 degrees upon the optical 32 or the key 35, any desired part of the film ing on the screen 27 a reduced image, well 55 said film aperture.

may be brought into coincidence with the The film is re-wound by operating the handle 32, and the wound film can then be removed and replaced by another.

The board or base on which the lantern support is mounted may be provided with a vertical screen 36 which is mounted thereon by an arrangement of rods of suitable length and position. Upon the screen may be placed the sheet of photographic paper to be used for an enlargement, it being attached thereto by means known such as a glass plate 37 hinged at the bottom at 38 and whose opening move ment is limited by connecting means 39. The said sheet is disposed between the screen and the glass plate, the latter being then folded into place and held by any suitable means.

In Fig. 2, it will be observed that in place of installing the enlarging apparatus upon a base, I use for this purpose the box or case L0 serving to contain the photographic apparatus, whereby a saving in cost and a reduction in total weight are obtained. The base 41 of the cylinder 25, carrying the optical system used for enlargement or screen projection, is herein secured to the top of the box by screws or by means of the pins or buttons 42 and the slots 43, so that the base can be removed by a slight rotation; or, like securing means may be employed.

The frame 36 with the swinging glass plate 37 is also removably mounted on the said box, by means of sliding or telescoping devices. The axis of the support 44 hOlding the screen 27 and the lens 26 is also removably mounted, for instance by rods engaging in sockets 45 secured to the said box.

Fig. 3 shows a device for placing the photographic paper so that it will automatically attain the proper height, and hence no part of the paper will be concealed by the hinge and thus be lost. For this purpose I employ in the frame 36 the bolts 46 which are controlled by the springs 47 in such manner as to bear upon the glass plate 37, the sheet of paper rests upon the spring bolts and the latter will yield to the pressure of the glass plate when raised against the board.

Against the board 36 (Figs. 4 and 5), which is made for instance of wood, are mounted two steel wires 53 endingin loops in which are en gaged the ends of the hinge axle 38 for the glass plate; said steel wiresare so disposed that the glass can only bear upon the lower part of the board by causing the flexion of said wires. preventing the descent of the paper below a given point. I employ the, members 39 for limiting the swing of the glass, which consist of flexible pieces or pivoted hooks, which prevent the glass from opening beyond a certain angle, and may be screwed so as to provide for its fastening. The clips 54 are mounted on the board 36 and serve to hold The hinge comprises a flange for,

the glass in the closed position when the paper is in place.

To limit the descent of the paper at a suitable point, I may further provide small bolts consisting of steel wires 55 mounted in recesses on the back of the board, (Fig. 7) or simply secured thereto, and passing through suitable holes in the said board; said wires are so disposed that for the maximum opening of the glass plate, the contact between the ends of the wires and the plate will be constantly maintained, and that the wires will automatically disappear when the glass plate is closed up. This action can be annulled by withdrawing the said wire bolts entirely to the back of the board and by placing them to one side, or by otherwise fastening them in a suitable manner. I may use several rows of the said bolts or stop-pieces, in order to accommodate paper of various sizes and to vary its position.

Having thus described my apparatus what I claim as new therein, and my own invent-ion, is

1. In an apparatus for the enlarging of photographs, the combination of a screen pro jection apparatus, a screen mounted in front of said apparatus and adapted to receive a sheet of photographic paper, a converging lens removably placed before the said projection apparatus, a small screen removably disposed between the said lens and the first-mentioned screen, said lens and small screen being adapted to be placed in front of the screen projection apparatus during the centering of the image, and to be removed when the View is projected upon the first-mentioned screen.

2. In an apparatus for the enlarging of photographs, the combination of a screen proection apparatus and a support for the same, said apparatus and its support being adapted for the rotation of said projection apparatus about its optical axis, a screen mounted in front of the said projection apparatus and adapted to receive a sheet of photographic paper, a converging lens removably placed before the said projection apparatus, a small screen removably disposed between the said lens and the first-mentioned screen, said lens and small screen being adapted to be placed in front of the screen projection apparatus during the centering of the image, and to be removed during the screen projection for enlarging' purposes.

3. In an apparatus for the enlarging of photographs the combination of a photographic apparatus, a condenser placed at the rear of the said apparatus, a lampmounted at the rear of the said condenser, a support provided with a tripod and carrying the whole combination of the photographic apparatus, the condenser and the lamp, said combination being rotatable in the said support about its optical axis, a screen placed before the said photographic apparatus and adapted to receive a sheet of photographic paper, a converginglens removably placed in front of the said photographic apparatus, a small screen removably placed between the said lens and the first-mentioned screen, said lens and small screen being adapted to be placed in front of the said photographic apparatus during the centering of the image. and to be removed when the image is projected on the screen for enlarging purposes.

4. In an apparatus for the enlarging of photographs, the combination of a photographic apparatus in which a film is wound upon two drums, a condenser placed in the rear of the said photographic apparatus, a lamp placed in the rear of the said condenser, a support provided with a tripod and carrying the whole combination of the photograph ic apparatus, the condenser and the lamp, said combination being rotatable in the said support about its optical axis, a screen placed before the said photographic apparatus and adapted to receive a sheet of photographic paper, a converging lens removably placed between the photographic apparatus and the first-mentioned-screen, a small screen removably disposed before the said lens, said lens and small screen being adapted to be placed in front of the said screen projection apparatus during the centering of the image and to be removed when the image is projected on the screen for enlarging purposes.

5. In an apparatus for the enlarging of photographs, the combination of a screen projection apparatus, a screen placed before said apparatus and adapted to receive a sheet of photographic paper, a converging lens mounted in front of the said projection apparatus, a small screen placed before the said lens, the said lens and small screen being secured to a support pivotally mounted on an axle which is parallel with the optical axis of the said lens.

6. In an apparatus for the enlarging of hotographs, the combination of a screen proection apparatus, a screen placed before said apparatus and adapted to receive a sheet of hotographic paper, a converging lens placed before the said projection apparatus, a small screen placed between the said lens and the first-mentioned screen, a support upon WhlCh the said lens and small screen are pivotally mounted, whereby they may be placed in front. of said projection apparatus for the photographs, the combination of a screen proj ection apparatus, a screen placed in front of said apparatus, and adapted to receive a sheet of photographic paper, a converging lens removably placed before the projection apparatus, a small screen removably placed before the said lens, the saidlens and small screen being-adapted to be placed before the said pro ection apparatus during the centering of the image and-to be removed when the image is projected for enlarging purposes, a base board on which are mounted the projection apparatus, the said lens and small screen, and the first-mentioned screen, this latter being made slidable whereby it may be moved from or towards the small screen.

8. In an apparatus for the enlarging of photographs, the combination of a screen projection apparatus, a screen placed in front of said apparatus and adapted to receive a sheet of photographic paper, a glass plate disposed in the frontpart of the said screen and hinged to the lower edge thereof, means for limiting the pivotation of said plate, means for holding said plate againstthe said screen, a converging lens removably placed before the saidprojection apparatus, a small screen removably placed before the said lens, said lens and small screen being adapted to be placed in front of the said screen projection apparatus during the centering. of the image and to be removed when the image is projected on the first-mentioned screen, and a base board upon which are mounted the said projection apparatus, the said lens and small screen, and the first-mentioned screen.

In testimony whereof I have hereunto affixed my signature.

ETIENNE OEHMICHEN. 

